User`s guide

Configuring STP and RSTP
Matrix DFE Series and N-SA User’s Guide 5-9
3. Reviewthestatusofspanningtreeononeormoreports:
show spantree portenable [port port-string]
4. Ifnecessary,re‐enablespanningtreeononeormoreports:
set spantree portenable port-string enable
Adjusting Spanning Tree Parameters
Youmayneedtoadjustcertainspanningtreeparametersifthedefaultvaluesarenotsuitablefor
yourbridgeconfiguration.Parametersaffectingtheentirespanningtreeareconfiguredwith
variationsoftheglobalbridgeconfigurationcommands.Interface‐specificparametersare
configuredwithvariationsofthespanningtreeportconfigurationcommands.Default
settings
are:
•Bridgepriority: 32768
•Portpriority:128
•Portcost ‐0(automaticallycalculatedbasedonportspeed)
•Bridgehelloti me ‐2seconds
•Bridgeforwarddelayinterval‐15seconds
•Bridgemaximumagingtime‐20seconds
•Maximumspanningtreeinstancesallowed:
–1‐9onMatrixDFE‐GoldSeriesmodules;
–1‐33onMatrixDFE‐Platinum
SeriesorN‐SAdeviceswith128MBofmemoryinstalled;
or
–1‐64onMatrixDFE‐PlatinumSeriesorN‐SAdeviceswithanadditional128MBmemory
upgrade.
Usethecommandsinthefollowing sectionstoadjustthesedefaults.
Setting the Bridge Priority
Youcangloballyconfigurethepriorityofanindividualbridge.Whentwobridgestieforposition
astherootbridge,thissettingaffectsthelikelihoodthatabridgewillbeselected.Thelowerthe
bridge’spriority,themorelikelythebridgewillbeselectedastherootbridge.
Tosetthe
bridgepriority:
set spantree priority priority [sid]
Validpriority valuesare0‐61440(inincrementsof4096),with0indicatinghighpriorityand
61440lowpriority.
Validsidvaluesare0‐4094.Ifnotspecified,SID0willbeassumed.
Note: Poorly chosen adjustments to these parameters can have a negative impact on network
performance. Please refer to the 1EEE 802.1D specification for guidance.